Using Load Balancers With Instant Messaging

Instant Messaging supports the use of load balancers located in front
of the Instant Messaging multiplexors. However, you cannot currently use load
balancers between the Instant Messaging multiplexors and the Instant Messaging
server.

When deploying Instant Messaging as part of a Portal Server/Secure Remote
Access deployment, you can locate load balancers between the Secure Remote
Access gateway and the Instant Messaging multiplexors.

Note –

If you just need security for the client connection, and not HTTP
tunneling, consider using SSL instead of Secure Remote Access. You can configure
a secure Instant Messaging client connection by enabling SSL on the multiplexors
and locating them outside the firewall.